Schweitzer Engineering SEL-351P, Quick Start Manual

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6-8 Close and Reclose Logic Date Code 990215
SEL-351P Manual Técnico
If 79CLS remains deasserted to logical 0 during this entire 79CLSD time window, when the time
window times out, the following occurs:
•
No automatic reclosing takes place.
•
Relay Word bit RCSF (Reclose Supervision Failure indication) asserts to logical 1 for
one processing interval.
•
The reclosing relay is driven to the Lockout State.
The logic in the bottom of Figure SECTION 6: .2 is explained in more detail in the following
text.
Set Reclose Supervision Logic (bottom of Figure SECTION 6: .2)
Refer to the bottom of Figure SECTION 6: .2. If all the following are true:
•
The close logic output CLOSE (also see Figure SECTION 6: .1) is not asserted (Relay
Word bit CLOSE = logical 0)
•
The reclosing relay is not in the Lockout State (Relay Word bit 79LO = logical 0).
•
The circuit breaker is open (52A = logical 0)
•
The reclose initiation condition (79RI) is not making a rising edge (logical 0 to
logical 1) transition
•
The Reclose Supervision Limit Timer is not timed out (Relay Word bit RCSF =
logical 0)
then a reclosing relay open interval time-out seals. Then, when 79CLS asserts to logical 1, the
sealed-in reclosing relay open interval time-out condition will propagate through
Figure SECTION 6: .2 and on to the close logic in Figure SECTION 6: .1.
Unlatch Reclose Supervision Logic (bottom of Figure SECTION 6: .2)
Refer to the bottom of Figure SECTION 6: .2. If the reclosing relay open interval time-out
condition is sealed-in, it stays sealed-in until one of the following occurs:
•
The close logic output CLOSE (also see Figure SECTION 6: .1) asserts (Relay Word
bit CLOSE = logical 1).
•
The reclosing relay goes to the Lockout State (Relay Word bit 79LO = logical 1).
•
The circuit breaker closes (52A = logical 1).
•
The reclose initiation condition (79RI) makes a rising edge (logical 0 to logical 1)
transition.
•
SEL
OGIC
Control Equation setting 79CLS asserts (79CLS = logical 1).
•
Or the Reclose Supervision Limit Timer times out (Relay Word bit RCSF = logical 1 for
one processing interval).
The unlatching of the sealed-in reclosing relay open interval time-out condition by the assertion
of SEL
OGIC
Control Equation setting 79CLS indicates successful propagation of a reclosing
relay open interval time-out condition on to the close logic in Figure SECTION 6: .1.
See Settings Example 2 that follows in this subsection.